Remove deprecated string features.

tests/standalone/io/http_parser_test.dart

Index: tests/standalone/io/http_parser_test.dart
diff --git a/tests/standalone/io/http_parser_test.dart b/tests/standalone/io/http_parser_test.dart
index fe4018a91bf84410536243bec18f40f0c9589c22..44fb92feba4c1a83d7279cdcf2c29a1e5a0f8d13 100644
--- a/tests/standalone/io/http_parser_test.dart
+++ b/tests/standalone/io/http_parser_test.dart
@@ -115,7 +115,7 @@ class HttpParserTest {
 
     // Test parsing the request three times delivering the data in
     // different chunks.
-    List<int> requestData = request.charCodes;
+    List<int> requestData = request.codeUnits;
     testWrite(requestData);
     testWrite(requestData, 10);
     testWrite(requestData, 1);
@@ -153,7 +153,7 @@ class HttpParserTest {
 
     // Test parsing the request three times delivering the data in
     // different chunks.
-    List<int> requestData = request.charCodes;
+    List<int> requestData = request.codeUnits;
     testWrite(requestData);
     testWrite(requestData, 10);
     testWrite(requestData, 1);
@@ -267,7 +267,7 @@ class HttpParserTest {
 
     // Test parsing the request three times delivering the data in
     // different chunks.
-    List<int> responseData = response.charCodes;
+    List<int> responseData = response.codeUnits;
     testWrite(responseData);
     testWrite(responseData, 10);
     testWrite(responseData, 1);
@@ -304,7 +304,7 @@ class HttpParserTest {
 
     // Test parsing the request three times delivering the data in
     // different chunks.
-    List<int> responseData = response.charCodes;
+    List<int> responseData = response.codeUnits;
     testWrite(responseData);
     testWrite(responseData, 10);
     testWrite(responseData, 1);